Add FORM_ReplaceSelection() and embedder tests.

This method replaces the selected text in a user-editable form text
area with another text string (which can be empty or non-empty). If
there is no selected text, FORM_ReplaceSelection() will append the
replacement text after the current caret position.

BUG=chromium:59266

Change-Id: I76448ef757d107888c33ebd5656457ebac93b952
Reviewed-on: https://pdfium-review.googlesource.com/8812
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Diana Gage <drgage@google.com>

4 files changed, 8 insertions, 6 deletions

diff --git a/fpdfsdk/formfiller/cffl_formfiller.cpp b/fpdfsdk/formfiller/cffl_formfiller.cpp
index a37a7501d0..e0af8955ac 100644
--- a/fpdfsdk/formfiller/cffl_formfiller.cpp
+++ b/fpdfsdk/formfiller/cffl_formfiller.cpp
@@ -245,7 +245,8 @@ CFX_WideString CFFL_FormFiller::GetSelectedText(CPDFSDK_Annot* pAnnot) {
   return pWnd ? pWnd->GetSelectedText() : CFX_WideString();
 }
 
-void CFFL_FormFiller::DeleteSelectedText(CPDFSDK_Annot* pAnnot) {
+void CFFL_FormFiller::ReplaceSelection(CPDFSDK_Annot* pAnnot,
+                                       const CFX_WideString& text) {
   if (!IsValid())
     return;
 
@@ -256,7 +257,7 @@ void CFFL_FormFiller::DeleteSelectedText(CPDFSDK_Annot* pAnnot) {
   if (!pWnd)
     return;
 
-  pWnd->DeleteSelectedText();
+  pWnd->ReplaceSelection(text);
 }
 
 void CFFL_FormFiller::SetFocusForAnnot(CPDFSDK_Annot* pAnnot, uint32_t nFlag) {
diff --git a/fpdfsdk/formfiller/cffl_formfiller.h b/fpdfsdk/formfiller/cffl_formfiller.h
index 96b7a69b29..4769716be5 100644
--- a/fpdfsdk/formfiller/cffl_formfiller.h
+++ b/fpdfsdk/formfiller/cffl_formfiller.h
@@ -75,7 +75,7 @@ class CFFL_FormFiller : public IPWL_Provider, public CPWL_TimerHandler {
   virtual bool OnChar(CPDFSDK_Annot* pAnnot, uint32_t nChar, uint32_t nFlags);
 
   CFX_WideString GetSelectedText(CPDFSDK_Annot* pAnnot);
-  void DeleteSelectedText(CPDFSDK_Annot* pAnnot);
+  void ReplaceSelection(CPDFSDK_Annot* pAnnot, const CFX_WideString& text);
 
   void SetFocusForAnnot(CPDFSDK_Annot* pAnnot, uint32_t nFlag);
   void KillFocusForAnnot(CPDFSDK_Annot* pAnnot, uint32_t nFlag);
diff --git a/fpdfsdk/formfiller/cffl_interactiveformfiller.cpp b/fpdfsdk/formfiller/cffl_interactiveformfiller.cpp
index 24bfd3c3b2..6d250408f0 100644
--- a/fpdfsdk/formfiller/cffl_interactiveformfiller.cpp
+++ b/fpdfsdk/formfiller/cffl_interactiveformfiller.cpp
@@ -523,13 +523,14 @@ CFX_WideString CFFL_InteractiveFormFiller::GetSelectedText(
   return pFormFiller ? pFormFiller->GetSelectedText(pAnnot) : CFX_WideString();
 }
 
-void CFFL_InteractiveFormFiller::DeleteSelectedText(CPDFSDK_Annot* pAnnot) {
+void CFFL_InteractiveFormFiller::ReplaceSelection(CPDFSDK_Annot* pAnnot,
+                                                  const CFX_WideString& text) {
   ASSERT(pAnnot->GetPDFAnnot()->GetSubtype() == CPDF_Annot::Subtype::WIDGET);
   CFFL_FormFiller* pFormFiller = GetFormFiller(pAnnot, false);
   if (!pFormFiller)
     return;
 
-  pFormFiller->DeleteSelectedText(pAnnot);
+  pFormFiller->ReplaceSelection(pAnnot, text);
 }
 
 void CFFL_InteractiveFormFiller::UnRegisterFormFiller(CPDFSDK_Annot* pAnnot) {
diff --git a/fpdfsdk/formfiller/cffl_interactiveformfiller.h b/fpdfsdk/formfiller/cffl_interactiveformfiller.h
index 17e9407924..b71f3a6ef7 100644
--- a/fpdfsdk/formfiller/cffl_interactiveformfiller.h
+++ b/fpdfsdk/formfiller/cffl_interactiveformfiller.h
@@ -84,7 +84,7 @@ class CFFL_InteractiveFormFiller : public IPWL_Filler_Notify {
   void RemoveFormFiller(CPDFSDK_Annot* pAnnot);
 
   CFX_WideString GetSelectedText(CPDFSDK_Annot* pAnnot);
-  void DeleteSelectedText(CPDFSDK_Annot* pAnnot);
+  void ReplaceSelection(CPDFSDK_Annot* pAnnot, const CFX_WideString& text);
 
   static bool IsVisible(CPDFSDK_Widget* pWidget);
   static bool IsReadOnly(CPDFSDK_Widget* pWidget);